Optical information-recording medium and optical information-recording method

1. An information-recording medium comprising a substrate having thereon a recording layer capable of recording information with laser light, said recording layer containing: at least one compound selected from the group consisting of compounds represented by the following general formulae (I-1), (I-2), (I-3) and (I-4); and an organic dye other than said compounds: wherein A 1 , A 2 , B 1 and B 2 each independently represents a substituent; Y 1 and Z 1 each independently represents an atomic group necessary to form a carbocyclic or heterocyclic ring; E and G each independently represents an atomic group necessary to complete a conjugated double bond chain; X 1 represents O, NR or C(CN) 2 ; X 2 represents O, NR or C(CN) 2 (wherein R represents a substituent); L 1 , L 2 , L 3 , L 4 and L 5 each independently represents a methine group which may be substituted; m and n each independently represents 0, 1 or 2; x and y each independently represents 0 or 1; and K represents an integer needed to neutralize the charge of the counter cation; R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 and R 8 each independently represents a hydrogen atom or a substituent (wherein each pair of R 1 and R 2 , R 3 and R 4 , R 5 and R 6 , and R 7 and R 8 may combine with each other to form a heterocyclic ring together with the nitrogen atom); R 9 , R 10 , R 11 , R 12 and R 13 each independently represents a substituent; p represents 1 or 2; and q and r each independently represents an integer of 0 to 4, and wherein said organic dye is an oxonol dye, and said oxonol dye is represented by the following general formula (II), wherein R 1 , R 2 , R 3 and R 4 each independently represents a hydrogen atom, an alkyl group, and aryl group, and aralkyl group or a heterocyclic group; L 1 , L 1 and L 3 each independently represents a methine group which may be substituted; m represents 0, 1, 2 or 3; and X k represents a cation wherein k represents an integer of 1 to 10.

2. The information-recording medium according to claim 1 , wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6, R 7 and R 8 in general formulae (I-1), (I-2), (I-3) and (I-4) each is a hydrogen or halogen atom, an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alkynyl group having 2 to 8 carbon atoms, an aryl group having 6 to 10 carbon atoms, an aralkyl group having 7 to 10 carbon atoms, or an alkoxy group having 1 to 8 carbon atoms.

3. The information-recording medium according to claim 1 , wherein X 1 is O and X 2 is O.

4. The information-recording medium according to claim 1 , wherein X k is a quaternary ammonium ion.

5. The information-recording medium according to claim 1 , wherein X k is an onium ion represented by the following general formula (II-1): wherein R 5 and R 6 each independently represents a substituent, R 7 and R 8 each independently represents an alkyl group, an alkenyl group, an alkynyl group, an aralkyl group, an aryl group or a heterocyclic group; each pair of R 5 and R 6 , R 5 and R 7 , R 6 and R 8 , and R 7 and R 8 may connect each other to form a ring; r and s each independently represents an integer of 0 to 4; and when r and s are not smaller than 2, the plural R 5 's and R 6 's may be the same or different.

6. A method of recording optical information, comprising recording information on an information-recording medium by irradiating a laser light having a wavelength in a range of 750 to 850 nm or a range of 600 to 700 nm, wherein said information recording medium is an information-recording medium as claimed in any one of claims 1 to 3 , 7 or 8 .